CN108675886A - A kind of selenium-rich zoology slow release fertilizer and preparation method thereof - Google Patents
A kind of selenium-rich zoology slow release fertilizer and preparation method thereof Download PDFInfo
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- CN108675886A CN108675886A CN201810908606.3A CN201810908606A CN108675886A CN 108675886 A CN108675886 A CN 108675886A CN 201810908606 A CN201810908606 A CN 201810908606A CN 108675886 A CN108675886 A CN 108675886A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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Abstract
The invention discloses a kind of selenium-rich zoology slow release fertilizers and preparation method thereof, are mainly matched and are formed in parts by weight by following components：35 parts of 100 150 parts of nitrogenous fertilizer, 120 160 parts of phosphate fertilizer, 80 120 parts of potash fertilizer, 40 60 parts of middle trace element mixture, 5 10 parts of sodium selenite, 10 15 parts of activated carbon ferriferous oxide magnetic coupling sorbing material, 20 30 parts of coating agent and synergist；The synergist is poly-aspartic-acid, pulullan polysaccharide and potassium fulvate according to 1:2‑4:46 mix.The present invention adds activated carbon ferriferous oxide magnetic coupling sorbing material in outer layer coated fertilizer, it can be during nutrients release, adsorption sustained-release is carried out to nutrient, it, to the pollution of soil, is the increasing selenium mode of safety and environmental protection under incomplete absorbing state to avoid selenite.The present invention realizes common fertilizer and fertilizers in a body function, improves selenium element utilization rate, reduces environmental pollution.
Description
Technical field
The present invention relates to agricultural technology field, specifically a kind of selenium-rich zoology slow release fertilizer and preparation method thereof.
Background technology
Selenium is the essential trace elements of the human body, is the important component of part antioxidase and selenoprotein in human body.It grinds
Study carefully and show that selenium has a variety of important physiological functions, such as healthy, the anti-oxidant, cancer-resisting that protection is cardiovascular and myocardium.People
Body selenium deficiency can lead to such as a variety of diseases of Keshan disease, cardiovascular and cerebrovascular diseases, cancer, hypertension.Selenium can not generate in vivo, human body institute
The selenium needed can only be absorbed from food.Chinese many areas belong to selenium deficiency or low selenium area, and national about 2/3rds populations exist
Different degrees of selenium intake is insufficient.Although selenium is not nutrient necessary to plant, plant is nature selenium ecological circulation
In key link and human body selenium direct sources.Using selenium-rich fertilizer to plant strengthen selenium have proved to be it is a kind of safety, it is low at
Originally, efficiently convenient selenium-rich means.
It can be divided into blade face selenium-rich fertilizer by the difference of fertilization mode and base applies selenium-rich fertilizer.Sustained release selenium-rich fertilizer uses special side
Method is processed selenium source, is slowly released using rear active ingredient, extends fertilizer efficiency acquisition time, reduces Available Selenium in soil
It is adsorbed in earth or fixed, to improve the utilization rate of selenium.In recent years, the research of novel sustained release fertilizer causes extensive concern, fertilizer efficiency
It is significantly improved compared with conventional fertilizers, and reduces the environmental pollution as caused by fertilizer loss, there is potential ecology, economy and society
It can be worth.However selenium-rich slow-release fertilizer is using limited at present, high effect is not undesirable for selenium element utilization rate, manufacturing process complexity cost
Height causes selenium-rich slow-release fertilizer and is difficult to effective utilization and extention.
Invention content
For problems of the prior art, the present invention provides a kind of selenium-rich zoology slow-release fertilizers and preparation method thereof.
The fertilizer effectively controls the release of selenium element, significantly improves soil selenium-containing amount, improves soil, improves crop yield and crops
Middle Se content.Ecosystem environmental protection material is respectively used simultaneously, it is pollution-free to soil environment.
To achieve the above object, the technical solution adopted in the present invention is：
A kind of selenium-rich zoology slow release fertilizer, is made of the raw material of following parts by weight：100-150 parts of nitrogenous fertilizer, phosphate fertilizer 120-160
Part, 80-120 parts of potash fertilizer, trace element mixture 40-60 parts middle, 5-10 parts of sodium selenite, activated carbon-ferriferous oxide magnetism are multiple
Close 10-15 parts of sorbing material, 20-30 parts of coating agent, 3-5 parts of synergist；The synergist is poly-aspartic-acid, Propiram is more
Sugar and potassium fulvate are according to 1:2-4:4-6 is mixed.
Selenium-rich zoology slow release fertilizer, the middle trace element mixture are calcium compound, magnesium compound, sulphur compound, boron
Compound, copper compound, iron compound, manganese compound, molybdenum compound and zinc compound any one or a few.
The nitrogenous fertilizer is any one in urea, ammonium nitrate and ammonium hydrogen carbonate；The phosphate fertilizer is monoammonium phosphate, di(2-ethylhexyl)phosphate
Any one in ammonium and potassium dihydrogen phosphate；The potash fertilizer is any one of potassium sulfate or potassium chloride.
The coating agent is epoxy resin and curing agent, weight ratio 8:2-5, the curing agent are triethylene tetramine, diethyl
Any one in alkene triamine, more ethylene tetramines and polyethylene polyamine.
The present invention also provides a kind of preparation methods of selenium-rich zoology slow release fertilizer, include the following steps：
（1）19.5g ferrous sulfate and 18.9g iron chloride are dissolved in 500mL deionized waters, 16.5g coconut shell powder activity is added
Charcoal, magnetic agitation 30min, heated solution to 20,40 or 70 DEG C；Quickly stirring is lower is added dropwise 5mol/L sodium hydroxide solution 100mL,
Then mixture is aged 4h in 100 DEG C of water-baths；It is cooled to room temperature, with deionized water washed product repeatedly；102 in baking oven
Dry 4h, obtains activated carbon-ferriferous oxide magnetic coupling sorbing material at DEG C -105 DEG C；
（2）Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist are weighed in proportion, cross 60 mesh sieve, it will
Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist after sieving are made into rotary drum after mixing
Grain machine, which is passed through steam, roll humidification and is granulated that obtain fertile slug particle spare；
（3）Epoxy resin is heated to 80-95 DEG C, according to weight ratio 8:The curing agent is added in 2-5, is uniformly mixed, and packet is made
Film liquid；Coating liquid is cooled to room temperature, by step（1）Coating liquid is added in gained activated carbon-ferriferous oxide magnetic coupling sorbing material
And stir evenly, obtain mixing coating liquid；
（4）By step（2）Gained fertilizer slug particle preheats 20 minutes in 60 DEG C, the rotary drums of 50rmp rotating speeds, and temperature is promoted to 80
It is DEG C -90 DEG C, repeated multiple times by step（3）Gained mixing coating liquid is added to the fertile slug particle surface of rolling, the packet being added every time
Film liquid accounts for the 0.5-1% of fertile slug particle weight, obtained selenium-rich zoology slow release fertilizer after cured.
Preferably, step（1）Middle coconut shell powder activated carbon is 200 mesh, purchased from Shandong hat Po Lam Tan Ye Group Co., Ltd.
Beneficial effects of the present invention：Reasonable employment nitrogenous fertilizer, potash fertilizer, phosphate fertilizer and middle trace element of the present invention prepare fertile core,
Comprehensive nutrition is provided for crop growth, selenium element is provided for crops using sodium selenite as selenium source, adds synergy
Agent poly-aspartic-acid, pulullan polysaccharide and potassium fulvate, three cooperate, and can make the nutrient in soil when each
Phase keeps higher validity, promotes absorption of the crops to nutrient.Especially poly-aspartic-acid is negatively charged, macromolecular
Poly-aspartic-acid can have negative ions certain suction-operated, selenium element can be promoted by agriculture with pulullan polysaccharide interaction
Crop efficiently absorbs, and itself is a kind of nontoxic degradable environmentally friendly product.The present invention uses chemical coprecipitation
Shallow lake method has synthesized the magnetic active carbon of high-specific surface area, high absorption property, makes an addition in outer layer coated fertilizer, is providing ferro element
While, adsorption sustained-release can be carried out to nutrient, avoid selenite in incomplete absorbing state during nutrients release
Under pollution to soil, be the increasing selenium mode of safety and environmental protection.The present invention realizes common fertilizer and fertilizers in a body function,
Selenium element utilization rate is improved, and preparation process is simple, it is at low cost, it reduces environmental pollution.
Specific implementation mode
Technical scheme of the present invention is described further with reference to specific embodiment, but not limited to this.
Embodiment 1
A kind of selenium-rich zoology slow release fertilizer, is made of the raw material of following parts by weight：100 parts of nitrogenous fertilizer, 120 parts of phosphate fertilizer, potash fertilizer 80
Part, 40 parts of middle trace element mixture, 5 parts of sodium selenite, activated carbon -10 parts of ferriferous oxide magnetic coupling sorbing material, coating
20 parts of agent, 3 parts of synergist；The synergist is poly-aspartic-acid, pulullan polysaccharide and potassium fulvate according to 1:2:4 mixing and
At.
Selenium-rich zoology slow release fertilizer, the middle trace element mixture are calcium compound, magnesium compound, sulphur compound, boron
The mixture of compound, copper compound, iron compound, manganese compound, molybdenum compound and zinc compound.
The nitrogenous fertilizer is urea；The phosphate fertilizer is monoammonium phosphate；The potash fertilizer is potassium sulfate.
The coating agent is epoxy resin and curing agent, weight ratio 4:1, the curing agent is triethylene tetramine.
The present invention also provides a kind of preparation methods of selenium-rich zoology slow release fertilizer, include the following steps：
（1）19.5g ferrous sulfate and 18.9g iron chloride are dissolved in 500mL deionized waters, 16.5g coconut shell powder activity is added
Charcoal, magnetic agitation 30min, heated solution to 20,40 or 70 DEG C；Quickly stirring is lower is added dropwise 5mol/L sodium hydroxide solution 100mL,
Then mixture is aged 4h in 100 DEG C of water-baths；It is cooled to room temperature, with deionized water washed product repeatedly；102 in baking oven
Dry 4h, obtains activated carbon-ferriferous oxide magnetic coupling sorbing material at DEG C -105 DEG C；
（2）Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist are weighed in proportion, cross 60 mesh sieve, it will
Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist after sieving are made into rotary drum after mixing
Grain machine, which is passed through steam, roll humidification and is granulated that obtain fertile slug particle spare；
（3）Epoxy resin is heated to 80 DEG C, according to weight ratio 4:1 is added the curing agent, is uniformly mixed, and coating liquid is made；
Coating liquid is cooled to room temperature, by step（1）Gained activated carbon-ferriferous oxide magnetic coupling sorbing material is added coating liquid and stirs
Uniformly, mixing coating liquid is obtained；
（4）By step（2）Gained fertilizer slug particle preheats 20 minutes in 60 DEG C, the rotary drums of 50rmp rotating speeds, and temperature is promoted to 80
DEG C, it is repeated multiple times by step（3）Gained mixing coating liquid is added to the fertile slug particle surface of rolling, and the coating liquid being added every time accounts for
The 0.5% of fertile slug particle weight, obtained selenium-rich zoology slow release fertilizer after cured.
Preferably, step（1）Middle coconut shell powder activated carbon is 200 mesh, purchased from Shandong hat Po Lam Tan Ye Group Co., Ltd.
Embodiment 2
A kind of selenium-rich zoology slow release fertilizer, is made of the raw material of following parts by weight：150 parts of nitrogenous fertilizer, 160 parts of phosphate fertilizer, potash fertilizer 120
Part, 60 parts of middle trace element mixture, 10 parts of sodium selenite, activated carbon -15 parts of ferriferous oxide magnetic coupling sorbing material, coating
30 parts of agent, 5 parts of synergist；The synergist is poly-aspartic-acid, pulullan polysaccharide and potassium fulvate according to 1: 4:6 mixing
It forms.
Selenium-rich zoology slow release fertilizer, the middle trace element mixture are calcium compound, magnesium compound, boron compound, copper
The mixture of compound, iron compound, manganese compound, molybdenum compound and zinc compound.
The nitrogenous fertilizer is ammonium nitrate；The phosphate fertilizer is Diammonium phosphate (DAP)；The potash fertilizer is potassium chloride.
The coating agent is epoxy resin and curing agent, weight ratio 8:5, the curing agent is diethylenetriamine.
The present invention also provides a kind of preparation methods of selenium-rich zoology slow release fertilizer, include the following steps：
（1）19.5g ferrous sulfate and 18.9g iron chloride are dissolved in 500mL deionized waters, 16.5g coconut shell powder activity is added
Charcoal, magnetic agitation 30min, heated solution to 20,40 or 70 DEG C；Quickly stirring is lower is added dropwise 5mol/L sodium hydroxide solution 100mL,
Then mixture is aged 4h in 100 DEG C of water-baths；It is cooled to room temperature, with deionized water washed product repeatedly；102 in baking oven
Dry 4h, obtains activated carbon-ferriferous oxide magnetic coupling sorbing material at DEG C -105 DEG C；
（2）Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist are weighed in proportion, cross 60 mesh sieve, it will
Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist after sieving are made into rotary drum after mixing
Grain machine, which is passed through steam, roll humidification and is granulated that obtain fertile slug particle spare；
（3）Epoxy resin is heated to 95 DEG C, according to weight ratio 8:5 are added the curing agent, are uniformly mixed, and coating liquid is made；
Coating liquid is cooled to room temperature, by step（1）Gained activated carbon-ferriferous oxide magnetic coupling sorbing material is added coating liquid and stirs
Uniformly, mixing coating liquid is obtained；
（4）By step（2）Gained fertilizer slug particle preheats 20 minutes in 60 DEG C, the rotary drums of 50rmp rotating speeds, and temperature is promoted to 80
It is DEG C -90 DEG C, repeated multiple times by step（3）Gained mixing coating liquid is added to the fertile slug particle surface of rolling, the packet being added every time
Film liquid accounts for the 1% of fertile slug particle weight, obtained selenium-rich zoology slow release fertilizer after cured.
Preferably, step（1）Middle coconut shell powder activated carbon is 200 mesh, purchased from Shandong hat Po Lam Tan Ye Group Co., Ltd.
Embodiment 3
A kind of selenium-rich zoology slow release fertilizer, is made of the raw material of following parts by weight：120 parts of nitrogenous fertilizer, 140 parts of phosphate fertilizer, potash fertilizer 100
Part, 50 parts of middle trace element mixture, 8 parts of sodium selenite, activated carbon -13 parts of ferriferous oxide magnetic coupling sorbing material, coating
25 parts of agent, 4 parts of synergist；The synergist is poly-aspartic-acid, pulullan polysaccharide and potassium fulvate according to 1:3:5 mixing and
At.
Selenium-rich zoology slow release fertilizer, the middle trace element mixture are calcium compound, magnesium compound, manganese compound, molybdenum
The mixture of compound and zinc compound.
The nitrogenous fertilizer is urea；The phosphate fertilizer is any one in potassium dihydrogen phosphate；The potash fertilizer is potassium sulfate.
The coating agent is epoxy resin and curing agent, weight ratio 8:3, the curing agent is more ethylene tetramines.
The present invention also provides a kind of preparation methods of selenium-rich zoology slow release fertilizer, include the following steps：
（1）19.5g ferrous sulfate and 18.9g iron chloride are dissolved in 500mL deionized waters, 16.5g coconut shell powder activity is added
Charcoal, magnetic agitation 30min, heated solution to 20,40 or 70 DEG C；Quickly stirring is lower is added dropwise 5mol/L sodium hydroxide solution 100mL,
Then mixture is aged 4h in 100 DEG C of water-baths；It is cooled to room temperature, with deionized water washed product repeatedly；102 in baking oven
Dry 4h, obtains activated carbon-ferriferous oxide magnetic coupling sorbing material at DEG C -105 DEG C；
（2）Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist are weighed in proportion, cross 60 mesh sieve, it will
Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist after sieving are made into rotary drum after mixing
Grain machine, which is passed through steam, roll humidification and is granulated that obtain fertile slug particle spare；
（3）Epoxy resin is heated to 90 DEG C, according to weight ratio 8:3 are added the curing agent, are uniformly mixed, and coating liquid is made；
Coating liquid is cooled to room temperature, by step（1）Gained activated carbon-ferriferous oxide magnetic coupling sorbing material is added coating liquid and stirs
Uniformly, mixing coating liquid is obtained；
（4）By step（2）Gained fertilizer slug particle preheats 20 minutes in 60 DEG C, the rotary drums of 50rmp rotating speeds, and temperature is promoted to 80
It is DEG C -90 DEG C, repeated multiple times by step（3）Gained mixing coating liquid is added to the fertile slug particle surface of rolling, the packet being added every time
Film liquid accounts for the 0.8% of fertile slug particle weight, obtained selenium-rich zoology slow release fertilizer after cured.
Preferably, step（1）Middle coconut shell powder activated carbon is 200 mesh, purchased from Shandong hat Po Lam Tan Ye Group Co., Ltd.
Comparative example 1
A kind of selenium-rich slow release fertilizer, is made of the raw material of following parts by weight：100 parts of nitrogenous fertilizer, 120 parts of phosphate fertilizer, 80 parts of potash fertilizer, in
40 parts of trace element mixture, 5 parts of sodium selenite, 20 parts of coating agent, 3 parts of synergist；The synergist be poly-aspartic-acid,
Pulullan polysaccharide and potassium fulvate are according to 1:2:4 mix.
The preparation without containing activated carbon-ferriferous oxide magnetic coupling sorbing material is removed in the preparation method of above-mentioned fertilizer and is added
Outside adding, remaining is the same as embodiment 1.
Comparative example 2
A kind of selenium-rich slow release fertilizer, is made of the raw material of following parts by weight：100 parts of nitrogenous fertilizer, 120 parts of phosphate fertilizer, 80 parts of potash fertilizer, in
40 parts of trace element mixture, 5 parts of sodium selenite, activated carbon -10 parts of ferriferous oxide magnetic coupling sorbing material, coating agent 20
Part.
In the preparation method of above-mentioned fertilizer in addition to the addition of no synergist, remaining is the same as embodiment 1.
Fertilizer application is tested
6 pieces of soil properties of selection are consistent, the uniform medium wheat planting field of fertility, are randomly divided into 6 experimental plots, experimental plot 1-3
Selenium-rich zoology slow-release fertilizer prepared by embodiment 1-3 is applied respectively, experimental plot 4-5 applies selenium-rich fertilizer prepared by comparative example 1-2 respectively,
Experimental plot 6 is blank control example, i.e., does not apply any fertilizer.10kg/ mus of dose, harvest time count Se content, yield and
The parameters such as flour extraction.Concrete outcome is as shown in table 1.
1 selenium-rich zoology slow-release fertilizer crop field manure trial result of table
The 1-3 groups wheat planting either yield of use soil fertility quality of the present invention is can be seen that from the result in above-mentioned table 1 still
Wheat Se content, protein content etc. are significantly increased, hence it is evident that are better than other comparative examples and blank control example.This is mainly due to
The selenium-rich slow-release fertilizer each component synergistic effect of the present invention, promotes absorption and utilization of the crops to selenium, improves soil, improve farming
Object yield and quality
It should be noted that above-described embodiment is only to realize the section Example of the preferred embodiment of the present invention, and not all reality
Apply example.Obviously, it is based on the above embodiment of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Lower other obtained all embodiments, should all belong to the scope of protection of the invention.
Claims (5)
1. a kind of selenium-rich zoology slow release fertilizer, which is characterized in that be made of the raw material of following parts by weight：100-150 parts of nitrogenous fertilizer,
120-160 parts of phosphate fertilizer, 80-120 parts of potash fertilizer, trace element mixture 40-60 parts middle, 5-10 parts of sodium selenite, activated carbon-iron oxygen
3-5 parts of 10-15 parts of compound magnetic coupling sorbing material, 20-30 parts of coating agent and synergist；The synergist is poly-aspartic
Acid, pulullan polysaccharide and potassium fulvate are according to 1:2-4:4-6 is mixed.
2. selenium-rich zoology slow release fertilizer according to claim 1, which is characterized in that the middle trace element mixture is calcification
Close object, magnesium compound, sulphur compound, boron compound, copper compound, iron compound, manganese compound, molybdenum compound and zinc compound
Any one or a few.
3. selenium-rich zoology slow release fertilizer according to claim 1, which is characterized in that the nitrogenous fertilizer is urea, ammonium nitrate and carbon
Any one in sour hydrogen ammonium；The phosphate fertilizer is any one in monoammonium phosphate, Diammonium phosphate (DAP) and potassium dihydrogen phosphate；The potassium
Fertilizer is potassium sulfate or potassium chloride.
4. selenium-rich zoology slow release fertilizer according to claim 1, which is characterized in that the coating agent is epoxy resin and solidification
Agent, weight ratio 8:2-5, the curing agent are appointing in triethylene tetramine, diethylenetriamine, more ethylene tetramines and polyethylene polyamine
Meaning is a kind of.
5. a kind of preparation method of the selenium-rich zoology slow release fertilizer described in claim 1-4 any one, which is characterized in that including
Following steps：
(1) 19.5g ferrous sulfate and 18.9g iron chloride are dissolved in 500mL deionized waters, 16.5g coconut shell powder activity is added
Charcoal, magnetic agitation 30min, heated solution to 20,40 or 70 DEG C；Quickly stirring is lower is added dropwise 5mol/L sodium hydroxide solution 100mL,
Then mixture is aged 4h in 100 DEG C of water-baths；It is cooled to room temperature, with deionized water washed product repeatedly；102 in baking oven
Dry 4h, obtains activated carbon-ferriferous oxide magnetic coupling sorbing material at DEG C -105 DEG C；
(2) nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist are weighed in proportion, cross 60 mesh sieve, it will
Nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, middle trace element mixture, sodium selenite and synergist after sieving are made into rotary drum after mixing
Grain machine, which is passed through steam, roll humidification and is granulated that obtain fertile slug particle spare；
(3) epoxy resin is heated to 80-95 DEG C, according to weight ratio 8:The curing agent is added in 2-4, is uniformly mixed, and packet is made
Film liquid；Coating liquid is cooled to room temperature, by step（1）Coating liquid is added in gained activated carbon-ferriferous oxide magnetic coupling sorbing material
And stir evenly, obtain mixing coating liquid；
(4) by step（2）Gained fertilizer slug particle preheats 20 minutes in 60 DEG C, the rotary drums of 50rmp rotating speeds, and temperature is promoted to 80
It is DEG C -90 DEG C, repeated multiple times by step（3）Gained mixing coating liquid is added to the fertile slug particle surface of rolling, the packet being added every time
Film liquid accounts for the 0.5-1% of fertile slug particle weight, obtained selenium-rich zoology slow release fertilizer after cured.
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| CN112544790A (en) * | 2021-01-04 | 2021-03-26 | 方连明 | Organic selenium feed additive and preparation method and application thereof |
| CN113854059A (en) * | 2021-10-28 | 2021-12-31 | 庐山市绿游生态农业开发有限公司 | Planting method of ecological organic selenium-rich agricultural products |
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| CN112079665B (en) * | 2020-08-20 | 2022-07-05 | 莱州市守喜镁业有限公司 | Magnesium sulfate fertilizer and preparation process thereof |
| CN112544790A (en) * | 2021-01-04 | 2021-03-26 | 方连明 | Organic selenium feed additive and preparation method and application thereof |
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